Russian forces take part in Cold War training in Arctic Siberia. Military tests in shocking minus 30C to check performance of equipment and personnel in toughest of conditions.

“We highly discourage fraternisation because of the threat of paid informants.

We can't force soldiers not to meet girls. We just tell them big boy rules – be responsible

US Army Captain Alex Hendel

“There will be people paid by the Kremlin to come and instigate things, so that Russia can expand upon it and make fake news out if it. We’re very aware of that. We’re very well briefed to be careful.”

Unusually for a deployment, however, soldiers will be given weekends off. But they will be forced to venture in groups, carry a special ‘recall radio’ and appoint one designated non-drinker.

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Moves will include restrictions when off duty, such as 'limiting fraternisation with local women'

Captain Hendel said: “Given the special circumstances, the reality is that we can't force soldiers not to meet girls. We just tell them big boy rules – be responsible.”

Already soldiers have been receiving “strange friend requests” on their private social media sites.

PFC Gumba, 19, from San Francisco, California, said: “Recently, we had strange emails, as well as personal messages on our social media including Facebook.

“It's a real threat.

“I've received multiple requests over the last week. I guess it's no coincidence that we were preparing to go to Poland.”

Specialist Stalvey, 26, from Los Angeles, California added: “They go through the regiment’s official website and pick if the names of soldiers who have liked posts. They claim to already know your buddies but we always check. It’s just common sense.”